JP3115908B2 - How to build steel stairs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of building a steel staircase, and more particularly, to a half-story building in which a floor slab is constructed by cast-in-place of concrete, and a landing portion is provided on each of the upper and lower sides of a step floor portion. The present invention relates to a method of building a folded-type steel staircase having an intermediate landing composed of minute steel stairs.

[0002]

2. Description of the Related Art In a building in which a floor slab is made of RC by cast-in-place of concrete, a folding steel staircase having an intermediate landing is built in the following construction procedure.

[0003] That is, concrete is cast in advance by assembling a floor slab form so as to form an opening for stairs, thereby constructing an upper floor slab, and then attaching a lower floor slab to the lower floor slab. A half-height steel staircase is hung by a crane and inserted through the stair opening of the upper floor slab, and the lower landing portion of the lower steel staircase is assembled to the lower floor slab by anchor bolts.

[0004] Thereafter, a steel stair at the height of the upper half floor to be assembled to the upper floor slab is hung by a crane and inserted through the stair opening, and the lower landing portion of the upper steel stair is lowered to the lower steel frame. The intermediate landing was formed by connecting to the upper landing portion of the stairs, and the upper landing portion of the upper steel stairs was assembled to the upper floor slab by anchor bolts, and these steps were repeated in order to build the steel stairs.

[0005] However, in the case of the above-described building method, if an external scaffold is not provided around the building, a work passage for ascending and descending on the formwork when the formwork of the floor slab is completed. And external scaffolds were indispensable. In addition, in this case, it is inconvenient to transport the material, because it is required to go up and down on the formwork through a narrow work passage provided on the external scaffold.

Further, in the above-mentioned method, a steel staircase composed of a stepped floor portion and landing portions provided on both upper and lower sides thereof must be inserted through a narrow staircase opening formed in an upper floor slab. There is a drawback that it is difficult to insert it and it takes time and effort to work, and there is a risk that the steel stairs may collide around the opening at the time of insertion and damage the steel stairs and the frame.

In a RC building, only the staircase room is made of S, so that a steel stair can be built in advance of the floor slab formwork, and the steel stair can be used as a work passage. However, in this case, despite the fact that the building is made of RC for the purpose of cost reduction, the amount of steel frame used increases and the construction cost increases.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above points, and an object of the present invention is to make it possible to easily and safely build a steel staircase.
It is an object of the present invention to provide a method of installing a steel stair that can be used as a work passage when the steel stairs are used as a work passage when arranging floor slabs or placing concrete.

[0009]

The technical means taken by the present invention to solve the above problems are as follows. That is, the method of installing the steel frame stairs according to the present invention includes, prior to the formwork of the floor slab, the second steel frame staircase on the upper landing portion of the first steel frame staircase assembled to the already constructed lower floor slab. The middle landing is constructed by connecting the lower landings
And, wherein the intermediate landings A ₁ on one side of the staircase only
While being supported by the standing steel columns 5, the upper landing portion of the second steel staircase and the lower landing portion of the third steel staircase connected to the upper landing portion are set up on a lower floor landing connected to the floor slab. After that, it is supported by the temporary support provided, and after that, the floor slab formwork connected to the upper floor landing composed of the upper landing part of the second steel staircase and the lower landing part of the third steel staircase is carried out. It is characterized by performing.

[0010]

[0011]

According to the above construction, at the top floor where concrete is to be cast, the second steel staircase is attached to the first steel staircase assembled to the floor slab already constructed by casting concrete. The pre-assembled, the pre-assembled second steel frame stairs, and the third steel frame staircase connected thereto are supported by the temporary support, and then the formwork of the floor slab, the rebar arrangement work, and the concrete casting are performed. The pre-assembled second and third steel stairs will be integrated with the floor slab.

[0012]

1 and 2 are explanatory views of a construction procedure showing an embodiment of a method of building a steel staircase according to the present invention, FIG. 3 is a partially cutaway enlarged side view of a main part, and FIG. 4 is a main part. It is a perspective view of. First, an example of a method of building a steel frame stair will be described with reference to these drawings.

As shown in FIG. 1A, the floor slab 1a on the top floor among the RC floor slabs 1 already constructed has a corrugated floor portion and landing portions provided on both upper and lower sides thereof. A first steel frame staircase 2 having a half-story height is fixed to an RC beam 3 located at the end of the floor slab 1a on the side of the staircase B by an anchor bolt 4. It is assembled in the state that was done. First steel frame stairs 2
The landing portion 2b on the upper side is connected to and supported by a steel column 5 which is sequentially extended by extending two layers from below.

At the upper side of the first steel frame stair 2, FIG.
(B), as shown in FIGS. 3 and 4, a half-story second steel frame staircase 6 having a similar configuration is connected to a crane or the like (not shown).
And the lower landing portion 6a is connected to the steel column 5 in a state of being positioned on the side of the upper landing portion 2b of the first steel staircase 2, and the lower landing portion 6a is connected through the steel column 5. And the landing 6a below the second steel staircase 6
The by concatenating the first upper landing portion 2b of the steel stair 2, constituting the intermediate landing A _1.

In the drawing, reference numeral 24 denotes a steel beam erected between the steel columns 5, 5, and 25 ... A attached to the steel beam 24.
It is an LC version and constitutes a fire-resistant wall that partitions the staircase room B and the elevator shaft C. 26 are gusset plates welded to the steel columns 5 and the steel beams 24. The steel stairs 2 and the steel stairs 6
6 are connected to the opposite side girders 15 by bolts and nuts 27.

[0016] On the other hand, as shown in (c) of FIG. 1, the temporary support 7 on the lower floor landing F ₁ leading to the top floor of the floor slab 1a
The temporary support 7 supports the landing portion 6b above the second steel staircase 6.

Further, as shown in FIG. 2 (a), a steel column 5 is extended with a steel column 5a for extension, and a third steel stair 8 having a similar structure and having a half-story height is provided with a crane or the like. (Not shown) and carried in, and the landing area 8 below it
a is supported by the temporary support member 7 and the upper landing section 8b is connected to the steel column 5a for extension, and the lower landing section 8a of the third steel frame stair 8 and the upper landing section of the second steel frame stair 6 are connected. constituting the upper floor landing F ₂ and a portion 6b mutually connected to.

An anchor bolt 9 is attached to each of the upper landing portion 6b and the lower landing portion 8a, and a floor connected to the upper landing F ₂ (the upper landing portion 6b and the lower landing portion 8a). A slab formwork and a beam formwork (not shown) are assembled, and reinforcement and concrete casting are performed in these formworks, and as shown in FIG. To build. After the construction of the floor slab 10, the temporary support 7 is removed and diverted to the upper floor.

Next, while the constructed floor slab 10 is used as the top floor slab 1a and the third steel frame stair 8 is used as the first steel frame stair 2, the same procedure as described above is repeated.
The steel stairs are built upward.

Next, a description will be given of the temporary support 7 used in the above-described method of building a steel staircase. As shown in FIG. 3 and FIG. 5 to FIG. 7 (however, for the sake of simplicity, FIG. 4 omits the step floor portions of the second and third steel frame stairs 6, 8). ) Temporary support 7
Is constructed by connecting a temporary beam 12 to the upper part of a pair of temporary columns 11, 11 with pins 13 and attaching a pair of turnbuckle-type braces 14, 14 in an X-shape.
And the landing part 6 of each of the third steel stairs 6, 8
The downward facing end faces of the slab girder 15 on both sides of a and 8a abut on the temporary beam 12 to be supported.

On the temporary beam 12, there are provided channel-shaped backing plates 17, 17 via auxiliary columns 16, 16, and a plurality of backing portions 6a, 8a provided by the backing plates 17, 17 on the back surfaces of the landing portions 6a, 8a. The reinforcing ribs 18 support the downward end faces. As the channel-shaped backing plate 17, even if the central horizontal plate portion is in contact with the downward end surfaces of the reinforcing ribs 18, 18, the end surfaces of the rising plate portions on both sides are in contact with the downward end surfaces of the reinforcing ribs 18, 18. It may be something.

As shown in FIG. 7, each of the temporary supports 11, 11 is constituted by connecting a lower support 19 and an upper support 20 with four adjusting bolts 21 so as to be adjustable in length. . The lower part of the lower support 19 is a floor slab 1a.
It is placed and supported on a plate 22 provided on the side.
The plate 22 may be integrally connected to the lower support 19. A bracket 23 is provided by welding on one lateral side of the upper part of the upper support 20 by welding, and the temporary beam 12 is connected to the bracket 23 by the pin 13.

[0023]

[0024]

[0025]

[0026]

As described above, according to the present invention, since the steel stairs are erected prior to the floor slab formwork, the steel stairs are required for the reinforcing work on the formwork, concrete placement, and the like. It can be used as a work passage, it is possible to omit the external scaffold around the building, and moreover, compared to the case of inserting a steel frame staircase through a narrow staircase opening formed in a conventional floor slab, The steel stairs can be built easily and safely in a large work space, and there is no damage to the skeleton due to the collision of the steel stairs, which is very effective in shortening the construction period and reducing construction costs.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a construction procedure showing one embodiment of a method of building a steel staircase according to the present invention.

FIG. 2 is an explanatory diagram of a construction procedure following FIG. 1;

FIG. 3 is a partially cutaway enlarged side view of a main part.

FIG. 4 is a perspective view of a main part.

FIG. 5 is a front view of a main part.

FIG. 6 is a plan view of a main part.

FIG. 7 is a cross-sectional plan view of a main part.

[Explanation of symbols]

1a: floor slab, 2: first steel staircase, 2a: lower landing part, 6: second steel staircase, 6a: lower landing part,
6b: Upper landing, 7: Temporary support, 8: Third steel staircase, 8a: Lower landing, F ₁ : Lower landing, F
₂ ... Upper floor landing, A ₁ ... Intermediate landing.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-202295 (JP, A) JP-A-62-160352 (JP, A) JP-A-63-277357 (JP, A) 5287 (JP, B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) E04F 11/00-11/116

Claims (1)

(57) [Claims] 1. Prior to floor slab formwork, a lower landing on a second steel staircase 6 is provided on an upper landing portion 2b of a first steel staircase 2 assembled on a lower floor slab 1a already constructed. and connecting portions 6a constitutes an intermediate landing a _1, wherein
It is erected only intermediate landings A ₁ on one side of the staircase
And while supporting at steel column 5, third to Tsuraneru the second upper landing portion 6b and the upper landing portion 6b of the steel staircase 6
The lower landing portion 8a of the steel frame stair 8 and the floor slab 1
supported by temporary support 7 which is erected on the lower floor landing F ₁ leading to a, thereafter, at a lower landing section 8a of the second upper landing portion 6b and the third steel staircase 8 Steel staircase 6 like an anchor method steel stairs and performing formwork construction of the floor slab continuous upstairs landing F ₂ configured.